[FFmpeg-devel] [PATCH] avcodec/xvididct: Fix integer overflow in MULT()
Michael Niedermayer
michael at niedermayer.cc
Sat Feb 1 02:12:03 EET 2020
Fixes: signed integer overflow: 23170 * 95058 cannot be represented in type 'int'
Fixes: 20295/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MJPEG_fuzzer-5800212870463488
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
libavcodec/xvididct.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/xvididct.c b/libavcodec/xvididct.c
index d8f3dd7072..14116bd6d3 100644
--- a/libavcodec/xvididct.c
+++ b/libavcodec/xvididct.c
@@ -142,7 +142,7 @@ static int idct_row(short *in, const int *const tab, int rnd)
#define TAN3 0xAB0E
#define SQRT2 0x5A82
-#define MULT(c, x, n) (((c) * (x)) >> (n))
+#define MULT(c, x, n) ((unsigned)((int)((c) * (unsigned)(x)) >> (n)))
// 12b version => #define MULT(c,x, n) ((((c) >> 3) * (x)) >> ((n) - 3))
// 12b zero-testing version:
--
2.17.1
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